physical education. n. (Education) training and practice in sports, gymnastics, etc, as in schools and colleges. Abbreviation: PE. physâ²ical educaâ²tion. n. instruction in sports, exercise, and hygiene, esp. as part of a school or college program.
3. Stress/injury. Stress on the tissues or any type of injury in the mouth can cause canker sores. Since the sores are actually tiny ulcers, they can be caused by any kind of hard brushing or eating something that can cause bruises or lead to tissue inflammation in the mouth.
Sores or localized abnormalities inside the mouth can arise from a number of causes. Mouth sores can occur on the tongue, gums, lips, or inside the cheeks. They may appear as ulcers or red or white patches in the mouth. Bleeding may sometimes occur if ulceration is severe. Bite injuries to the tongue or inside of the cheek are a common cause of mouth sores.